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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6442f4abb198779ce8a33b5495b902df4cca45d1449567080492157598a9691c' 
  AND token = 'RhlCg1omP8oN4glzFkflyfF/NNydlh6BtKd6qqTri1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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