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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79acdf81fb8e6e5527033217c047c259b5f8878fb45ac746de09fd43981e4c6e' 
  AND token = 'qJ8Ptp1urWdDBjhtxgkIC8jh/XCac5oPWTvWbkKiewI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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