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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65ac07282fa53da55468a5a9595cd6d7509876c8e302255a9964f8ba6e4f6dde' 
  AND token = '/wtKveXqQqKTePfFJbloHB0IwhfkMU56+4BdxMGxyBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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