SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1f0e5317b6f285bca88d1d0e799c0564b59cc17353eca7683ce0ebf4ed7c164' 
  AND token = 'JKq3JjH8AV2Z/krRc5v+nNaAfgBfDKF0UUpeJiEDmqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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