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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce5574040ec8b93c88a6698994a191d2e5337c434ef97058baec1e8ed8a26e8c' 
  AND token = 'KrpRzaTzYa0iKgfp2OrIbUUJs9VSiZCe1mfmqfjr/30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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