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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9aec6da83fa16fd0baf9af62e328c02a398093b9a72ad83eb0c8b5e490e1b27' 
  AND token = 'lS7Q1rghC5Qe8slBNXyMQFH8ZB1GUBT9RhLL4/wdVKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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