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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '860beab1f2bd60553c87a068747fceef027632d3bbac54284ac83c8e57c72f02' 
  AND token = 'hahD9zfLd7IyQIQXwUKNKrNehVlc9TimAb8p9qC4X8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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