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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dce89295d6168e76f948224dd5b0ba1323cba318edf9ef7e445a08c2a7b1c33' 
  AND token = '9rtnFbtqp6FbL5xjaNnUThX2EnI2QZH4++V2ok/1QCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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