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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b67cb099928a2248293e906a4fc454088de2e2b93402c170368d61bcc631a2dc' 
  AND token = 'zROhMfPS2aGv+iyfzDDbHApLcX4nFuLsj7oGPvLyOh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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