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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26613bc1a7533356ba740ef8cb7dc54de9dc6a08587259870c8efd7cbd7734f3' 
  AND token = 'dwseT0M7Y8RHF1nCmzxOn0rv8MgP9TxAzVsjx+Gg8YU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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