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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '225a460c58ff0ca417de68cbe698a07f5dbf3417f6e8824ad9497575d456be8c' 
  AND token = 'hfXXn8oYN0VBAkAYbozXcqNF5MWnaqGWuHYeO3bVkns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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