SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c622d4bb752d355db78a7bfca1c61f2f11c1146361d4baae3e6c5d6ae4ce5507' 
  AND token = 'BKCy6II7rYKPr1Fu9D/BOY3PoyTVp/YBhjg+GxZit84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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