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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9d24ba2eb09a6b6c3f6d754de0668c46d19f48c15bfdebb53a1d716243d2168' 
  AND token = 'dG9ME0BocJrJ9bNlxkT0aN5+CkKKAUNk8DW49u9c6rI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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