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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79734d7fa6c1b4e9fe956523d61fc874f3b6ca297bd09fe97c516e9108ac1c69' 
  AND token = '0J3bCZx9GeGz6LMC5+ga4gonf8nx8AdmCcncUlYCwMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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