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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3f0299208641aa475018ea511c39c92f592e26617e798308ad52892a85fbb0f' 
  AND token = 'owAIOEp9dIvS+7f4JAH83xtaTvr81ZlxYRUKofh1344=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00159

JSON explain

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