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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36e0bd75b87d01db267c5c5bc69c7194b5a339d22ac63c5da4ec876dd7b9596b' 
  AND token = 'QQaTtYwOgSE3baMyWO5ua6wk+whFoxXKTcEshUe+bsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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