SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75f0eb0269d8bd387edb7fcf3fdba6b6e10876c584667e2c7948f2e8e46dc496' 
  AND token = 'hTI/vSRrD/rwFFJ/F7GVE9Aq6lVQIzJC14YG8g1e2K0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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