SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4da3d44fae0e4b67b6dd658dc259f8fb1b89fb082c63efb913a8b47bfadfdca8' 
  AND token = 'HmzpmFjGSmhYmwJ2eFtBoTNHyywCPBY5oLQhY32x+GY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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