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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e08cb5ae85c31d190093154ad84e18d373813c67b795bccffb7175fe74a2d92f' 
  AND token = 'kFlcygZsb9Xd3ce9uUEr8V+W43Syw3k8rQl3VdRbkcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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