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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86b4e2b652a003af63af1105debe3e97d69b80e62c10cad264302e53035d4601' 
  AND token = 'NvXfNaoqP75jx2iZUdHh9YDA0SZQ5eDbtuw99SeAoX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}