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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50e1e97a102b2b82ae7326b8dda82d5ce23a82de55b782cd544e59063e52c40b' 
  AND token = '08GLMbD/lmjeWp9aWXCU7RcHAnnNC7TYdN1YdgY0W8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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