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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2af15e3a04e5bbfd612f420bf5e46e2b51a346a5d3a1f4cb6b5a3db30ac000b4' 
  AND token = 'EspwpCbYIDb3JFRYlODd6CgbanTeiu6mRqdzTTtDkYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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