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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b5a7b6a720971fa41565d6407d92e4d8603e0fd22107e33af5795ba2b5212fe' 
  AND token = 'LDP5y7xBG0AEFi/js/Hd8WIscHLqkdWh6oFMCZjJyMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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