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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '966569eff234112fed3afdec1da86e7a21fee3ba2a391c4c43ef74dc05631914' 
  AND token = 'zDGblodLI5ZTtAjqM38/9eNX0fbOiO6b9gyzWwk2hMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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