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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc3b8c2f198847ec6bc47da4305d9a5ca1e5fc5a3860a0db5e515e24b026a329' 
  AND token = 'Zb9MSoZMHOMpQV586a0uPQ0HTZSy5frunbJkkg6bYMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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