SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c86f4fee057b9b72cb53133d424a43532aa7a7f5a1d0aa6f96df97f595b67fe' 
  AND token = 'y33ZjEdVLqAhUKCj8T+8ChLZsLA0p/FgyfKbgVMfEIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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