SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24298332f01031400ea7b7b4d4a2f35f17a7912f0b60283185d0fdbf2b977709' 
  AND token = 'crb4vNYJlo2cnrBwCABHuE7TCVq9hjKj0Y+UJmqIKOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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