SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65b2ac4f16746a9aabb4cb2f120bafe2b70836c02bd61fada604fb5855400e45' 
  AND token = 'BnSjnGyNfvwzvGsCF7q3t7O5LQgs2hPUvprUpT+SIAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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