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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99d9678701306c4dc8485302034df86b5752381fd7d3a79e7b6d4e9403d34310' 
  AND token = 'v655Cc1AhDlrNQut7TBQcq8w4L755dPpH3nWojyqjz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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