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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c839bd0bf332e8c5c1a76d5c989c4678f52fd350c5e929161556e214075a30a' 
  AND token = 'vJffrteIZ00s+lFfBYpVPX9DhJOtYdQKJyq6afSkJAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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