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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33c9a4aab571faac63afb4004793a6ced4992e5e418e5343b61cbb63bdf43475' 
  AND token = 'G3Xellb3kbo3tYac0m1Pqnrh0H/nSitZ1GkWpXFCjxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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