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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5f42de5805369153b6ad1da5ff567e4504518a48a64ac13e8b48cb6ea6df5a7' 
  AND token = 'wySArFUM95xZeLrq1w55zv0cyaZFGwVfObqfZCOj5hM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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