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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '583cedcd5a9d3732b2c3cde6ab24b669f1f8cc143f397597216491f27d5dfc56' 
  AND token = 'ZpDqMP0Zu430hglWD3D6mopD7b0VncUJjVYiQ2nUp34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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