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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72c550eeba82c0d6d9920a18a7c6f4bb662570abbfe05cb6081ac88ee5ef5e88' 
  AND token = 'zrSvl4bZMu10vv01wDlzPSD1gEpHhV8AidumChR7D+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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