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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '976a4d3b605ee91b501201cc0e3af6bfee7d4574d06984f431ee4023c5cd59b5' 
  AND token = 'YoQSYu+zAkR1c9psYlS31NtHdK8OW6JtqQp+/mDhYwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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