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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f15575e2b4f55e4bef46b89d8d7c87617cd540522cb8b9f4af3843bf6c6501fd' 
  AND token = 'hu2scZuytheYNpqG3cl0cjo38QVH6YZoM6tjb2zKsnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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