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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf1a8ef59f5dac37f9da5b9d76d97ddda24f85912f576330d6d40573a3cc0f43' 
  AND token = '5i5PJy8C1zGOEvUSpNM8jTemqT+Rd5hWH8pMko6H5Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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