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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56835110972dda44967b46137355a0fe2286a4944be03f126bdf781bf2f5e923' 
  AND token = 'c8po323tQm9XFrj5ZFkT+qnMi3qbOV+6NonHVASLHK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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