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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26b16dc95ef50266f47debb7626e121b78362b225a35c56bdcae08a6076cfd8d' 
  AND token = 'in8SpS4HRc1+BzbFudc5M9Tg8tdkG6Bx0fCw/X69qw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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