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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c63f54576c3555dcdfc06ae0b8905371466eef1f7f08afa89783b9234641d23' 
  AND token = 'vDnK2EH5XzNxjBy5T2NBJ0TQB5A94JK72At9ShG3O3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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