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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dad6793e4b179b6a46904f39d64c044cd2b754c68fa37f741d97ab4f738a31ce' 
  AND token = '47TP7sEJqnZlFyahFr5+7D+0TYEIMgFo+2k/uDKAvlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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