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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf9e6aaa32f3d0bfc0f8c72ff9b0030483abaeff699adae342c6a2dc69694aff' 
  AND token = '1Mbl3gjPmPVhTgw823y0vCVDOtbIexpeasbacldYCmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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