Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa0da2842b714cdb6d3f31fe8ffba8a0700eb40354e4637ba4013cfb450b6c51' 
  AND token = 'txHAInJrZ7aNDE3g7BZvqmjD3zXcj24VLZ5utXYb+eE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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