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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dcb4f72bbadcf9fec6b8b6917e3fd9949cc8dc7c4ada6d9952a087bfd3c16e9' 
  AND token = 'IL5Rz8P1yUcUe3r1QEDaS8XffFTniMIfZvGlC5avNCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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