SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f42cce1c758b0af4d4871dd149a9fb1a9146ab8750f581df1973db5e7662952b' 
  AND token = 'gWsbRxPKo4nRixDWzjNBSpL/DvGFJ1HeUZXItSYbGHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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