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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db8960210b9a8d621335a46e9c559d0a218f62f191acc090dcdea0ee15ff8e07' 
  AND token = 'HO4iR5Ar8jhXE+sDJzHPAXD9HQMZkfNncrzr9mgsAJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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