SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0249d25d0aff1b4326d49abf95e3f5ec16d54f721cd4aa3fff82a779c6891606' 
  AND token = 'p2jChl8XM/mn0bwz/jZsLAyo4rf3Vpq3/RZvK/Dnawo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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