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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24c6e6a40c52d9a1c0c2b5d22c9b87e1d7d0a32653a5ff8fd941a323ff73c8e3' 
  AND token = 'n2iqATH+QPdTP6qxlnP2Iwi0zxP4W63uw1OFTiMidNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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