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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '081e293ce296d72fd1b20a429a985a8a745daa5dc719a598fc7ae4b5f06dd491' 
  AND token = 'vd2mA/kX1g1lv5hlzzOeQIJKo2+AT5MJ54XqbLIOIQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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