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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd98fe16a1502fbb09d5ddfe28f4ef09834377f88d9e558533db3c77a7141105' 
  AND token = 'm6XEg6bRNwxKv72zL6XFlaQjUSLdWBmWNf5XHFKRGMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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