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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90fc8e8b2a367105ab20796659c19b0201bf3c0d59ef7b550d5b7d2ac065ab49' 
  AND token = 'kGZSLHk7AjFdu3xU65YNEl3oBHbOIeujWga6ZY4inOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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