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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcc42e82dba2f32381e11183b798eb5d935fd5cfd1bcc91eb3eb9e29df533a5b' 
  AND token = 'BbXT5KGyrJ6L8Id3/vSvJgr0HBu2RllPTpw0dIqKk34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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