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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d77ddb727d3a6dfa8ad59dcd11fe82fdb4a17e43a0143255938e44604bbf0f9' 
  AND token = '998azem5bL/6PxhuLON6b8Q3QCwTqFGQpqXUirf4jYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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