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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df97f53a06878731ddff96d9022c3504cd03753183c8c92df0d4b7742fade21a' 
  AND token = '4SxjzyowcVPBxH2y88kCiAFerGc0lORCuU/kKuRdUVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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