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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa9fd63704d10f58bc423dcf458fa0692edeb0eb64daebdc598b03fa68a816f9' 
  AND token = 'qQnRFtbafrYWd5btgNdcuOU3B1gYhMIuMw1+y5Q7AvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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