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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dafa5fd1468c1d5a3d6faa5d1cd53440e8be2230e5a9b4164dc3eef087989cb4' 
  AND token = 'LdvYhmlLRxaMv4US6/QHmPS3ONtkYz3r5RK2FYo/njM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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