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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d02737f51a9726333b84eb5c6ba7549cfcede2092050c4f4333463eceac8f1e' 
  AND token = 'P96cXqshQJy9DxMylneav+MMdvrrL/85MmTapHdRork=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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