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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c08d86045b5fad984f6793936e4bc88e68b7f586db64d600104bafeb7f43aca' 
  AND token = 'z+fouPVi8oOyT0yF/a3v73IxRecCAnLwDJUk38ZpLJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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