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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5585aae8aa6865726ec8cb9cf5a5cfcdb8ea487cb5392c06069e6c7e146db1d9' 
  AND token = 'CAxJbslLu4l6M+EjTiPal0kkf9FqH+cZ3SMN9QlDyPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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