SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79b561ccab412905d523e479e4a6b794dd12352a29302b54c28c278bfe8d3073' 
  AND token = '4YDHG/99mwKq8JauYJkBDsDHjoQC3zsdWFC8dLJWtoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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