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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1301ac1811763c7c144630c17520f8f355314df9452e4819fdda715a8ce4d893' 
  AND token = 'muwHs+vYQTfifguNnyEfg3Y6t+ieJLkpangDsF/gt/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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