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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '725a61ce7b65bbc7b0a002c8d3c9efd3fc9537735810215a281b4599ff61069b' 
  AND token = 'fOOZKQue0SuWrMSoxC4b5QTFDkA5XbrblsA9DX/7zWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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