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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc9df31e0bfb9dc7077e3a0a44fe4fd7edd1b38d1b7610cd641239cb33a064a9' 
  AND token = '8R09vCHuLa1mY7oEinpI6VTTQt/bcDHlzt5as82QR9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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