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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c96c79751655d569edf31647afd55d1d3618eec62fe6074cc0577e98f80e805d' 
  AND token = '9w7Tn+JfbqjP2k/0e//zGqDG6Mxk5JhU1bRnZEbIj/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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