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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f4f33132ad20cef859ecaaec80b48355837f8d93a7dd14cf4ad7c5538df05ac' 
  AND token = 'f8T5vw1hK5KOes5hGAh6GmQjb0L3oeXS+J4NiqE4HbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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