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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a68d415ef8c601efc31fc6fc12f41d4f07fcaa9f6c321a36ffe38339f3252c57' 
  AND token = 'kmqbO1JhKDvVxl6AsOMUCgTiML9qAMZwiow2zFIp7Ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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