SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f473f4436b9e890b0c4f6b3b3bfb8f21e122c967cbc468fec5780ad8cd9a4b8f' 
  AND token = 'EkKw/RUSiuZtF4DT8r5JIO1UW1Sakg68FBjcn+/zuYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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