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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3418469a30540f27d5a7a80505d8b67fd3e4ce89c93e345a54c7bf8c56cb71e9' 
  AND token = 'REXttBNdkOZ62mxJaTuaL8YCRRA5BgbZKZoLL+6obd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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