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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca154f389b447733528890ba9b557ee2e09b680b445def3754bf08aa18d67aff' 
  AND token = 'lHr/3Z1/O76STnlyrIUtblBOufXktn2TQfIAErsdaKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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