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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7126482f30fbca7b676bde072c83582d2b313780241d207e561b2721a77da50d' 
  AND token = '9/CYWDV54coRoSU26MA8REt73/YJ8gIfF/wdiPYfbPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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