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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9776e40922e8230e2c2839b237a0bc7057e63153263b2f3fe89483a6d24fb389' 
  AND token = 'A2+OkcrfB6ztcww0h9IaAm0i8QK/0v5EUEo2COx9sx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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