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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35ebce49b477a1de128956eb389f1547136439578f1e84d919dbd5e659f55a3d' 
  AND token = 'm9hIXyNfkgr3tsVXPxIUyvXOgQk1N3PdxKP7Wlv6LJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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