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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6357651b84b1638fd29a656bbb7c8153ace3ffe358e8ef9cb341011d53670eb2' 
  AND token = 'Xgd00xptGnjfqALtKLoWQQGIH+vROiihwrNpuPT6cxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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