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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9788db17f450c02063d84fc85e4f737e196c574b64d15510388341fbdb16a3f' 
  AND token = 'E1urxgOUDvuowaQrCad0oJjsUw/60Z9ACeWKEmEJTSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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