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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cca4f5876e96147eeb661b542118b41ca14a5933af11e2955544d500176ae00' 
  AND token = 'vPfhbVWLRQCnNod1pHaGo9Jnu0/QDX62OQAC3xiUS/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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