SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45e524935eff2b797ca14a0616b390b5a6dfec40262836db31d4890311166665' 
  AND token = 'O7WUDvKYQEpqQ1wQaKh97vZQzDeUDYkF3fg3jpm6/Sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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