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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ff7a38b5b69f7939b234e065c4ff5bf4a73502eccd8dc8cb37369491ee6ffa7' 
  AND token = 'W7SwQACp2CAXLU+m9X2rsDNeirXjcyR0zAjKIM6cNOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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