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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74af8b88622c8b5fa049b6306d6386af839206c7017fd781287c747f42913d29' 
  AND token = '6Lxd9HGJS9MDu6wAUyY05mol+oPvyvksXER7qQjOHJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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