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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea46c61c22dd464058d0d5fff1d7ef8d9329b4f49f1ab39b5d65b52724f444ab' 
  AND token = 'e2NWkfp5Izwcxfd3pGyLzqubb6ouOVu0dTkoqLF8Q5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00138

JSON explain

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