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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '611db91ec9513c0964382eb36898ae5d0081b603e8506c818d111b1ca01ae416' 
  AND token = 'Owb9Y58NsmRs19PpFjIKvzliMhHrX/xs2vS+aIAzM2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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