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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2747d7872b3b1991682b549e743b5c009734e9fd3897b6cdddd9d1ecafcdc14c' 
  AND token = '6LVjsEfZrl6mcAThnEhuo8+dMkrJpVvYEAte/k7PjJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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