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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6edfaa719ef56e563616b2048a1b157d0693adc51fb1f7198a8a4bd86a129ebd' 
  AND token = 'l1++RmE/6LfpZG3HgZub8skZKD4DlVgm8Xfg4Y+SM/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00100

JSON explain

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