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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7992310c61455fd31686303ef688cae75ee4506d86f20602d102553156a03b9' 
  AND token = 'nUt1VzQ7WcUKW1trm7yR4CnOlPIJdLR4hh2CONF66K8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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