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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69fea55c2188ee1712f601f331db66921673d0daa75c7177de6f579e08af95df' 
  AND token = 'tYZf56U3svZoIJni74DcYNfb3v/JwbzENU/sXzVWYj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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