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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12da34292fff168ae8d61f2b07fd77ccbc9a5beb511350a1db626025d9ce6262' 
  AND token = '7qrnB7G5v/dA09l1+UQ+z9Dm72JcpAE0yalr5UpMpZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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