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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4360f0144bc9656283da53b9b3eda441fbb4c1c382f41739867780c2732922ed' 
  AND token = 'Jv38EhgzIgV8tfJ7bitJTWEHcG7x9RoVba71W5H2458=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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